Fountain-pen.



P. RIBSENBERG.

FOUNTAIN PEN. APPLICATION: FILED JAN.24, 1910.

Patented Apr. 19,1910. 7

mural? WI T IVE SSE S FELIX RIESENBERG, OF NEW YORK, N. Y.

FOUNTAIN-PEN.

' Specification of Letters Patent. Patented Apr, 19, 1910.

Application filed January 24, 1910. Serial No. 539,794.

To allevhorn it may concern:

Be it known that I, FELIX RIESENBERG, a

citizen of the United States, residing in the borough of Manhattan, city, county, and

State of New York, have invented certainv new and useful Improvements in Fountain- Pens, of which the following is a full and i in particular 'to means whereby the amount of ink contained in the font of the pen can be ascertained from the-outside at any time, the particular means employed I affording various advantages whichwill be referred to hereinafter.

In the accompanying drawings illustrating my invention, Figure 1 represents a full view of a fountain pen embodying my improvement. Fig. 2 represents a longitudinal section through the font on the llne a ;a' in Fig. 1. Fig. 3 represents a transverse section on the line yy in Fig: 1. Fig. 4 is a plan view in larger scale of one of the lenses 5 illustrated in Figs. 1 and 2. Fig. 5 repre sents a transverse section through the lens shown in Fig. 4 011 the line A-B. Fig. 6 is a transverse section through the lens shown in Fig. 4: on the line G-D.

For the purpose of ascertaining the amount of fluid contained in the font of the pen, I employ a plurality of lenses 5, Figs. 1 and 2, which are arranged on the font in a row at suitable intervals as shown in Fig. 1. While theselenses-may consist of any suitablematerial, I prefer a clear annealed glass with which I have obtained the best results. These lenses are preferably round and are preferably provided with a shoulder 2 near'the outer face of the lens, as shown in Figs. .2 and 3, with which they rest in a suitably shaped opening in the wall'of the font as shown inFig. 2. The lenses may 'be cemented onto their seats by any kind of cement or similar material, however preferably by means of rubber cement which I find will keep the seats tight in spite of the slight expansion of the font by the heat when carried in the pocket. The shape of the lenses is preferably so that'theirouter I face will conform with the outer surface of the font so that no crevices or grooves are produced at the joint between the glass and the font, in which dirt can collect. For this reason, I have formed these lenses at their outer face cylindrical, so that these outer faces form in the direction ab, Fig. 4, (which is longitudinal to the parallel axis of the 'font) a plane as shown at a, Fig. 5, while in the direction cd transverse thereto, these lenses are convex and conform with the cylinder formed by the font as shown at a, in Fig. 6. The inner face of each lens is preferably convex as'shown at 12 Figs. 5 and 6 and also in Figs. 2 and 3, by which I obtain the best results. This particular combination of lens I shall refer to hereinafter in the claims as a convex plano-convex lens. I It is obvious, however, that any other lens suitable means, for instance by enamel or also by any other suitable light reflecting material is indicated at 4 so that the observer can easily ascertain through any of the lenses whether the portion of the font where the particular lens is located contains ink or not.

By employing lenses instead of plane glass as has been suggested in similar devices I gain the advantage of more clearly showing to the observer whether the font contains ink or not, owing to the magnifying qualities of the lenses, which are obviously of such construction that they are focused to the light reflecting surface.

What I claim is:

1. In a fountain pen, an ink font of opaque material, having a portion of its interior wall of color distinct from that of the ink, and perforated in the side opposite said portion and provided in said perforation with a lens adapted to focus light on the wall of the font opposite said lens.

2. In a fountain pen, an ink font of opaque material, having a portion of its 1nterior wall of color distinct from that of the ink, and perforated in the side opposite sald portion and provided in said perforation with a convexo-plano-convex lens adapted to the opposite Wall of the font, such opposite focus light on the Wall of the font opposite Wall being coated with color distinct from said lens. that of the ink.

3. In a fountain pen, an ink font of FELIX RIESENBERG. 5 opaque material having its wall perforated Witnesses:

in series longitudinal of the font, lenses in CLINTON H. BLAKE, J12, such perforations adapted to focus light on H. ALFRED JANKE. 

